1989705636502 has 8 divisors (see below), whose sum is σ = 2984791680000. Its totient is φ = 994775076504.

The previous prime is 1989705636461. The next prime is 1989705636509. The reversal of 1989705636502 is 2056365079891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989705636509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38838877 + ... + 38890072.

It is an arithmetic number, because the mean of its divisors is an integer number (373098960000).

Almost surely, 2^{1989705636502} is an apocalyptic number.

1989705636502 is a deficient number, since it is larger than the sum of its proper divisors (995086043498).

1989705636502 is a wasteful number, since it uses less digits than its factorization.

1989705636502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77741750.

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 1989705636502 in words is "one trillion, nine hundred eighty-nine billion, seven hundred five million, six hundred thirty-six thousand, five hundred two".